GPS HEIGHT TRANSFORMATION BASED ON MOVING SURFACE FITTING
Ding Haiyong 1) ; Yang Yanzhen 2) ; Wang Xinzhi 1) ; and Wang Xiaoying 1)
1)School of Remote Sensing, Nanjing University of Information Science and Technology, Nanjing 2100442)Civil Engineering Department, Shandong Jiaotong University, Jinan 250023
Abstract：To improve the accuracy of GPS height transformation from geodetic height to normal height, the moving surface fitting algorithm is presented to fit every subregion. The point whose normal height is unknown is selected as the circle center. Given the original value of the region semidiameter, a conicoid is fitted by use of the known points in the region. For the illposed equations appeared during the surface fitting, ridge estimation algorithm is used to improve the accuracy of parameter estimation. Some numerical experiments show the feasibility and higher accuracy of moving surface fitting algorithm by compared with other methods
